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/* GNU Objective C Runtime @synchronized implementation

   Copyright (C) 2010 Free Software Foundation, Inc.

   Contributed by Nicola Pero <nicola.pero@meta-innovation.com>

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 3, or (at your option)

any later version.

GCC is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

Under Section 7 of GPL version 3, you are granted additional

permissions described in the GCC Runtime Library Exception, version

3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and

a copy of the GCC Runtime Library Exception along with this program;

see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

<http://www.gnu.org/licenses/>.  */

#ifndef __objc_sync_INCLUDE_GNU

#define __objc_sync_INCLUDE_GNU

#include "objc.h"

#include "objc-decls.h"

#ifdef __cplusplus

extern "C" {

#endif

/* These functions are automatically called by @synchronized().  */

/* 'objc_sync_enter' is automatically called when entering a

   @synchronized() block.  It locks the recursive lock associated with

   'object'.  If 'object' is nil, it does nothing.  It returns

   OBJC_SYNC_SUCCESS on success; see the enumeration below for error

   values.

   Note that you should not rely on the behaviour when 'object' is nil

   because it could change.  */

objc_EXPORT int objc_sync_enter (id object);

/* 'objc_sync_exit' is automatically called when exiting from a

   @synchronized() block.  It unlocks the recursive lock associated

   with 'object'.  If 'object' is nil, it does nothing.  It returns

   OBJC_SYNC_SUCCESS on success; see the enumeration below for error

   values.  */

objc_EXPORT int objc_sync_exit (id object);

/* All the possible return values for objc_sync_enter() and

   objc_sync_exit().

 */

enum {

  OBJC_SYNC_SUCCESS = 0,

  OBJC_SYNC_NOT_OWNING_THREAD_ERROR = -1,

  OBJC_SYNC_TIMED_OUT = -2,

  OBJC_SYNC_NOT_INITIALIZED = -3

};

#ifdef __cplusplus

}

#endif

#endif /* not __objc_sync_INCLUDE_GNU */